Description
High-performance blind-hole tap for UNC threads.
Application
For UNC uniform coarse threads ASME B1.1.
Features
HSS-E-PM.
AlTiX coating.
Optimised flute geometry.
Advantages
High process reliability.
Product Data
Product type: Blind-Hole Machine Tap UNC
Article family: 137870
Thread size: 1/4-20
Thread form: 45°/40° right-hand helix
Tolerance: ISO 2X 6HX
Tool material: HSS-E-PM
Coating / surface: AlTiX
Dimensions
Overall length L: 80 mm
Shank diameter Ds: 7 mm
Square: 5.5 mm
Recommended tapping-hole diameter: 5.1 mm
Threads per inch: 20
Thread diameter: 6.35 mm
Cutting Data
Steel <500 N/mm²: 30 m/min
Steel <750 N/mm²: 25 m/min
Steel <900 N/mm²: 20 m/min
INOX: 10 m/min
ISO Code
Aluminium and plastics: N
Aluminium: N
Aluminium cast >10% Si: N
Steel <500 N/mm²: P
Steel <750 N/mm²: P
Steel <900 N/mm²: P
Steel <1100 N/mm²: P
Steel <1400 N/mm²: P
Hardened steel: H
INOX: M
Titanium: S
Cast iron: K
Copper alloys: N
Graphite / GRP / CRP: N